New to Camping and looking for help
It doesn't much matter what the listed dry tongue weight is. Your tongue needs to be a minimum of 10% of the loaded weight to tow it safely. Most people go for around 13% as even 10% can be a little light. (And the listed dry tongue weight is often without battery, without propane, without power tongue jack and without load in the trailer which makes their listed weights even less helpful to consumers).
What's the yellow sticker weight of the trailer you just bought? If it's 5145 dry in the brochure, it's likely closer to 5500# on the yellow sticker. Then add 1000# of gear, and you're around 6500# loaded and you'll already be over the max tongue weight of your SUV assuming you can keep it at 650#. Some trailers are hard to keep at 10% so your tongue could be easily be over 700#.
You can tell you've got too much tongue weight from your pic. Your vehicle has too much squat in the rear and is too high in front. This will compromise breaking and handling and will ensure your BMW suspension components wear quickly.
Also, you should have a WDH for any trailer over about 5000# (trailers under that weight can often benefit as well) and that will add another 100# to your tongue (60# if you go with the Andersen hitch) and that's adding more to your already too heavy tongue.
Also consider that the GVWR of that trailer is over 7000#. If fully loaded, you could have a tongue weight of up to 1000#. Way over what you can tow.
Hopefully a new vehicle is in your budget or that the dealer will let you trade in your trailer for a smaller unit as they sold you one too large for your tow vehicle.
2015 Jayco X213
2014 Ford F-150 Platinum EcoBoost w/ MaxTow